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MEMOIRS OF THE NEW YORK BOTANICAL GARDEN [Vol. 8, No. 4 



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Wanama R., NW. Dist., May 1923, de la Cruz 4016 (F, GH, MO, NY, US); Assakatta, NW. 

 Dist., Sept. 1923, de la Cruz 4361 (NY, US); Moraballi Creek, April 1941, Fansbawe 693 

 (F.D. 3429) (BGF, U); bank of Potaro R., Tumatumari, July 1921, Gleason 406 (GH, NY, 

 US); Tumatumari, along Potaro R., June-July 1921, Gleason 934 (NY); Penal Settlement, 

 Dec. 1919, Hitchcock 17243 (GH, NY, US); right bank of Canje R., opposite Kabayari 

 Creek, Dec. 1914, Hohenkerk 52-B <BGF); British Guiana, 1843, Hostmann 1136 (G); Ore- 

 alla Savanna, Corantyne R., Sept. 1879, im Thurn s.n. (P); Orealla, Corantyne R., Oct. 

 1879, ]enman 36 (P); Mazaruni R., Aug. 1889, J enman 5243 (NY); Membaro Creek, upper 

 Mazaruni R., Sept. 1938, P-27 (F.D. 279D (BGF); British Guiana, June 1924, Persaud 34 

 (F, UC); Membaru Creek, upper Mazaruni R., Sept. 1938, Pinkus 29 (F, G, GH, MO, NY, 

 US); Moraballi Creek, near Bartica, Essequibo R., Sept. 1929, Sandwitb 275 (NY, U); Es- 

 sequibo R., 1836, Schomburgk 10 (G, NY, W); Guiana angl. Scbomburgk 133 (P, W); Guiana, 



1841, Scbomburgk 210 (G, P, U, W); British Guiana, 1838, Scbomburgk 375 (F, G, GH, P, 

 US, W); Mazaruni Station, right bank of Mazaruni R., May 1933, Tutin 93 (US); Kantume R., 

 July 1908, no collector or number (NY). 



SURINAM: Bover Cottica, Focke 697 (U) (TYPE of M. elegans Miq.); Assirikama, Cor- 

 antyne R., Sept. 1911, Gonggrypp 113 (U); Surinam, Hostmann 1056 (GH, P, W); Surinam, 



1842, Hostmann & Kappler 1136 (F, G, MO, P, U, W); Marowyne R., Sept. 1846, Kappler 

 1930 (P, U); middle Marowyne R., Aug., Kappler 2003 (U); Surinam, McArthur s.n. (Yale 

 For. Herb. No. 35409) (Y); Tafelberg Creek, Saramacca R., Oct. 1944, Maguire 24895 (F, 

 MO, NY, U, US); Surinam, Miquel s.n. (NY); Bover-Surinam R., near Goddo, Jan. 1938, ML 

 Wilbemina Exped 75 (U); Bover Gran Rio Maupedam, Feb. 1938, ML Wilbemina Exped 183 

 (U); Watramiri, Oct. 1918, Sur. For. Bur. 4035 (U); Watramiri, March 1919, Sur. For. Bur. 

 4300 (IAN, U); Watramiri, Oct. 1919, Sur. For. Bur. 4431 (IAN, U); Watramiri, Feb. 1920, 

 Sur. For. Bur. 4546 (MO, U, US); Watramiri, Dec. 1920, Sur. For. Bur. 4999 (MO, U); Watra- 

 miri, June 1921, Sur. For. Bur. 5263 (U); Watramiri, Oct. 1921, Sur. For. Bur. 5407 (IAN, 

 MO, U, US); upper Suriname R., June 1921, Sur. For. Bur. 5468 (U, US); Watramiri, Dec. 

 1921, Sur. For. Bur. 5579 (U); Coppename inf. Aug. 1903, Went 124 (U); Wullschagel 

 819-A (W); Albina, Ri'o Marowyne, Sept. 1853, Wullscblagel 1434 (W). 



FRENCH GUIANA: Gourdonville, Sept. 1914, Benoist 1615 (P); La Charbonnere, Oct. 

 1948, For. Service 4254 (U); Guyane-Francaise, 1792, Leblond 192 (G); Guyane Francaise, 

 1834, Leprieur 341 (G, P); 1838, Leprieur's.n. (P); Cayenne, Martin s.n. (F); Maroni, 1845, 

 Melinon 5 (GH, P), 1876, Melinon 80 (G, P), 1861, Melinon 117 (P); Couana, Melinon 131 

 (NY, P, US); Acarouany, 1876, Melinon 227 (\, BM, K, P); banks of Maroni R., 1862, Meli- 

 non 420 (A, F, G, GH, NY, P, US); French Guiana, 1863, Melinon s.n. (F, P); Maroni, 

 1864, Melinon s.n. (F, GH, NY, P, US); French Guiana, 1820, Perrottet s.n. (G); Guiane, 

 Poiret s.n, (P); Richard s.n. (P); Karouany 1854, Sagot 185 (GH,"P); Acarouany, 1856, 

 Sagot 185 (P, W); Maroni, Wachenheim 184 (P). 



Vernacular Names: Brazil: "ipe", "ipezeiro". Venezuela: "parue-dek" (Are- 

 kuna). British Guiana: "sarebebe" (Arawak, "water wallaba", "bootooba". Suri- 

 nam: "watrabirihoedoe". 



The four more or less closely related species, M. bifolium, M. latifolium, M. 

 angustifolium, and M. duckeanum, probably constitute a divergent line from the 

 main unijugate line of relationship. Of these, the first two are undoubtedly the 

 most closely related of the four. Macrolobium bifolium differs from Af. latifolium 

 by the former's smaller, less coriaceous bracteoles, and its smaller bracts which 

 are glabrous on the inner surface; and the hairs of all its parts are predominantly 

 ribbon-like. Also, whereas M. bifolium is widely distributed, M. latifolium is nar- 

 rowly restricted to the Bahia region of eastern Brazil. The hairs of the latter are 

 clavate and a few such hairs are sometimes to be observed scattered amid the 

 ribbon-like hairs of M. bifolium. 



This species has more frequently been confused with M. angusti folium but they 

 may be separated by a number of good characters. The costa of the leaflets is sul- 

 cate on the upper surface inM. bifolium but strongly salient in M. angusti folium. 

 The shape and size of the bracts are completely different and the bracteoles of 

 the latter species are pubescent on the inner surface, as are the bracts, but glab- 

 rous within in M, bifolium. The ovary of the latter is pubescent on all surfaces 

 and this pubescence persists on the fruit, but the ovary of its relative is pubes- 

 cent only on the margins and its fruit is glabrous or with only a few marginal hairs. 



